Hi, I’m having the same problem but would like to check a few parameters with you to see if they are the same.
Have you updated plugins to v10 or did you use the Legacy version of Waves Central for v9 plugins?
I used the Legacy Offline installer to reinstall v9 plugins after updating to v10 without meaning to.
Cubase Pro 9.0.40 then blacklisted all Waves plugins, 32 bit and 64 bit.
Reactivating them failed in every case. (“Contact vendor”)
Any advice?